| Light is a kind of energy carrier and has particle characteristics.Therefore,a certain amount of thrust will be generated during light propagation,but the energy density of ordinary light is not enough to push the object forward.The emergence of lasers has made it possible to use light-propulsion objects to move.Laser propulsion is a propulsion technique that uses a laser as a propulsion source.It has now been successfully implemented using high-energy lasers to move large-size objects in the direction of the laser.Laser propulsion is used in the attitude adjustment of small satellites.With the rapid development of science and technology,people are increasingly exploring the microcosm.Therefore,laser propulsion is also very important for the promotion of laws in the microscopic world.This paper introduces the concept of advance research status of the proposed laser has nearly 65 years.Then introduced the different propulsion effects of laser propulsion in different environments.In particular,we detailed the laser induced air plasma in the air.The shock wave generated by the high-temperature and high-pressure plasma at the time of blasting generates thrust on the object during propagation.And we gave a detailed introduction to the theoretical analysis of shock wave pressure.The specific content of our work is shown as following:First,we independently designed and manufactured a firing device for firing glass microspheres by using a thermal melting method.We use the hot stretching method to draw conical fibers in a fiber-optic welding machine.And we achieved that the fiber tip diameter is controllable.Then,based on this,we used a 532 nm pulsed laser to advance micron-sized glass microspheres.We obtained the microspheres movement law with variation of the output energy of the laser and the size of the microsphere is changed.The experimental results are basically consistent with the analysis results of plasma blasting theory.Finally,in order to increase the efficiency of the laser in the air,we proposed an experimental scheme for laser advancing glass microspheres in a capillary tube.In our experiments,we found that in addition to increasing the propulsive efficiency of the laser in the capillary,when the microsphere is at a certain distance from the end face of the fiber,thelaser will also exert a suction effect on the microsphere.We did some experimentation and model analysis based on the laser-induced suction phenomenon.We finally concluded that this phenomenon is also due to the thrust generated by laser-induced plasma explosion. |
